Hoisting and luffing mechanism for cranes



July 1.7, 1923. L46L80 R. s. LEWIS HOISTING AND LUFFING MECHANISM FORcmmss Filed net. 2, 1922 2,Sheets-Sheet 1 Q j Q I 5x I I k 0 w i Q lifzrs.

July 17, 1923. 1,461,800

R. S. LEWIS HOISTING AND LUFFING MECHANISM FOR CRANES Filed Oct. 2, 19222 Sheets-Sheet 2 @MXW- jays.

$M & BEER "LIMITED, OF IPSWICH, ENGLAND, A CQMEA.

HOIS'E'ING LUFFING EKECHANISM F0 CR.

Application filed October a, 11.922 Serial Ito. semis.

To all whom it may concern:

it known that I, Bonner STANLEY I LEWIS, a subject of the King ofEngland,

til

bers are arranged coaxial and residin at Ipswich, Suilolk, in England.have invented certain new and useful Improvements in Hoisting and LufingMechanism for Cranes, of which the following is a specification.

This invention relates to cranes of the kind in which mechanisms forhoisting the load and lufling the jib can be so coupled to a singlesource of power as to be driven either alone or simultaneously, a brakeholding that mechanism not in use against movement.

The object of the invention is to provide a compact and light mechanismb means of which the crane can be controlle in a simple manner, as isparticularly desirable when the crane is of the locomotive or travellingty e.

According to this invention the driven member or members normally engagea stationary brake and this brake is released automatically when the twoparts of a friction clutch carried respectively by the driven anddriving members are brought into engagement. Preferably the constructionis such that when axial movement in one direction is imparted to thedriving member or to a clutch carried thereby,'the two clutch members onthe driving and driven members are gradually and progressively coupledtogether while simultaneously the driven member gradually disengages itsstationary braking surface. Converse y axial movement in the oppositedirection two halves of the c utch and simultaneously applies the brakein a gradual or progressive manner.

To this end the driving and driven memy with one another and in thepreferred construction the driving member is disposed centrally betweentwo driven members each of which carries a combined clutch and brakemember adapted respectively to engage a clutch part carried by orrotating with the driving member and a stationary brake cone surroundingthe driven shaft. The two driven members are respectively geared to ahoisting barrel or winding barrel and preferably all the clutch andbrake mechanism is enclosed in a suitable casing from which project onlythe driving pinions and the sprmgs tending to mainmember A, clutchmembers an gradually disengages the tain the driven members in theirbrakes.

In the accompanyin drawings Figure 1 is a centrafi sectional elevationthrough the driving and driven members showing the hoisting and luilingbarrels and their driving pinions, and

Figure 2 is a plan, on a reduced scale. In the construction illustrateda driving member com rising a worm wheel A keye to a sleeve is mountedto rotate upon a fixed shaft B the ends of which are supported insuitable standards C. The worm wheel A is engaged by a worm D driven byan electric motor indicated at C Figure 2 connected to the casing Ccontainin the driving d brake memengagement with bers hereinafterdescribed.

Formed within and preferably integral with the casing C are verticalpartitions C bored to form supporting bearin s for the driving member A.The vertical members C-' also support fixed cams E which are drilled soas to clear the driving sleeve A. Surrounding the cam-faces on themembers E are annular bearing members E in which cam-shaped bosses F aremounted to rotate, these bosses bein adapted to co-operate with the camsE and eing provided with operat ing levers F extending through slots Cin the top of the casing C Mounted on each end of the driving sleeve Ais an externally coned friction clutch member Gr, capable of axialmovement upon the sleeve but keyed to the sleeve so as to rotatetherewith. Each clutch member G'is normally forced towards the wormwheel A by means of a spring'G', but by rotating the cams F by means oftheir operatin levers F, axial movement may be imparte to the clutchmembers owing to the co-operation between the inclined faces of therotary cams F and fixed cams E, 4

Near each end of the shaft B isia driveii member which can rotate andalso slide, in an axial direction upon theshaft. One driven wheel A bymeans of their respective spiral springs H, J.

' and K secured to the casin The clutch members G, J4 are so arrangedwith relation to the fixed brake memversa.

bers K, K and externally coned movable brake members H, J 5 that if theclutches are engaged the brakes are released and vice In Fi re 1 thederrick barrel J 2 is shown as hel against rotation, the brake J 5 ofthe driven member J being in engagement with its fixed brakin cone Kunder the action of the spring a and the clutch G bein held out ofengagement with the interna ly coned clutch member J by means of theclutch spring G.

On the other hand, the driven memb'er H is shown as having been movedaxially away from the driving member against the action of its spring Hthrough'the rotation of the cam F relatively to the fixedcam E. As aresult the clutch H has been engaged by the clutch G and the brake H hasbeen moved out of engagement with the fixed brake cone K so that thehoisting 'barrel H will be rotated. r

The pinions H, J are in constant mesh with the wheels on their res'ective barrels and when the cam levers either to engage or disconnectthe clutch members H, J these clutches will operate in a gradual or roessive manner, the respective brake 5 being applied or released inproportion to the extent of engagement between the two parts of the'corresponding clutch. V

In the drawings certain features forming no part of the invention areomitted to prevent confusion and the hoisting and derrick barrels areshown only in outline.

It is to be understood that the constructional details may varyconsiderably without departing from this invention, and that although abarrel has been shown for varying the inclination of the derrick ifdesired some other known means may be employed as, for example ascrewthreaded shaft controlled by the clutch and brake mechanism alreadydescribed.

What Iclaim as m invention and desire Letters atent is 1. In hoistingand lufling mechanism for cranes the combination of a driving member,driven members coaxial therewith on either side thereof, a luflingmechanism geared to one of the driven members, a oisting mechanlsmgeared to the other driven member, a clutch member on each drivenmember, corresponding clutch members on the driving member, a brakemember on each dr1ven member, a stationary are moved,

hoisting mechanism geared to the other driven member, a stationary brakesurface for each driven member, va clutch member for each driven memberon the driving member, a combined brake and clutch memher on each drivenmember, means tending normally to maintain said combined members out ofengagement with their respective driving clutch and in engagement withtheir stationary brake surfaces, and means for imparting axial movementto the driving clutch members to couple the driving and driven membersand simultaneously disen .gage the corresponding brake members.

3. In hoisting and lufling mechanism for cranes the combination of adriving member, driven members coaxial therewith on either side thereof,a lufling mechanism geared to one of the driven members, a hoistingmechanism geared to the other driven member, a

stationary brake surface for each driven,

member, avconical clutch member for each driven member mounted to slideupon the driving member, a correspondingly coned clutch member on eachdriven member, a brake surface on each driven clutch member, meanstending normally to maintain said brake surfaces in contact with theirrespective stationary brake surfaces,,and independently operated meansfor sliding the driving clutches into engagement with theircorresponding driven clutch members whereby these clutches areprogressively coupled and the corresponding brake members aresimultaneously released, axial movement in the opposite directiondisengaging the clutch members and simultaneously applying the brake.

4. In hoisting and lufiing mechanism for cranes the combination of adriving member, an axially movable driven member mounted torotate oneither side thereof and coaxial therewith, hoisting and lufiingmechanism respectively geared to said driven members, a combined clutchand brake member carried by each driven member, a stationary brake conenormally engaged by the brake portion of each driven member, frictionclutches for each driven member mounted to slide upon the driving memberand independently operated cams for slidin the driving clutches intoengagement wit their corresponding driven clutch members, each clutchbeing thus progressively cou- Ill pled and simultaneously thecorresponding driven member being moved in an axial direction so thatits brake members are caused to disengage in a correspondinglyprogressive manner, axial movement in the opposite direction disengagingthe two parts of the clutch and simultaneously applying thecorresponding brake in a progressive manner. a

5. In hoisting and lufiing mechanism for cranes the combination ofadriving member an axially movable driven member mounted to rotate oneither side thereof and coaxial therewith, hoistin and lufiing mechanismrespectivel care to said driven members, a coned friction clutch memberand a braking cone forming part of each driven'memher, a stationarybrake cone for each of said ment with their respective stationary brakecones, sprin tending normally to maintain said bra e members 1n engacones, a friction clutch for each driven member mounted to rotate with.the driving member and adapted to slide in an axial direction relativelyto the driven member, cams rotatably mounted on the driven memher, andindependently operated means for rotating said cams to impart axialmovementto the driving clutches and thereb to the driven members inopposition to t eir controlling s rings, whereby the two parts of theclutc are caused to engage and simultaneously the corresponding brakemembersare disengaged in a gradual manner, rotation of the cam in theopposite direction permitting the controlling s ring to disconnect theclutch members an simultaneously apply the brake in a gradual and.progressive manner.

In testimony whereof I have signed my name to this s ecification.

ROB RT STANLEY LEWIS.

